Abstract
The electrocatalytic oxidation of two sulfur(-II) species (thiourea and thiosulfate) on a polycrystalline platinum electrode was studied by combining cyclic voltammetry (CV) with high-performance liquid chromatography and capillary electrophoresis. The surface sulfur species distribution and the charge transfer peaks of the CV curves depend on the formation of chemisorbed oxygen (such as OHads and Oads), indicating that these electrocatalytic reactions are mediated via the chemisorbed oxygen species. The formation of chemisorbed oxygen species plays a dual role during the electrode processes as the poison for metal degradation and the bridge for the electrocatalytic reaction.
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